America's natural-born population could edge toward extinction in just 500 years, startling new data suggests. Not taking into account immigration or major changes in death rates, statisticians predict this group could be cut by at least one-third every 75 years. Based on the current trends, recent Census data predicts the natural-born population in the US will be back to levels of the post-Civil War era in the next 300 years, with just 60million people. And around the year 2600, this population could dwindle to only 10million, a number not seen since the early 1800s when the country bounced back from...